What is the Rio+20 Conference, often mentioned in the news?

1. A

   It is the United Nations Conference on Sustainable Development

   (a) It is the United Nations Conference on Sustainable Development. Rio+20 (Rio de Janeiro, 2012) was the UN Conference on Sustainable Development, twenty years after the 1992 Earth Summit. That is the official key.

2. B

   It is a Ministerial Meeting of the World Trade Organization

   (b) It is a Ministerial Meeting of the World Trade Organization. WTO ministerials are separate (e.g. Doha, Bali). Not Rio+20.

3. C

   It is a Conference of the Inter Government Panel on Climate Change.

   (c) It is a Conference of the Inter Government Panel on Climate Change. IPCC plenaries adopt assessment reports; they are not branded Rio+20.

4. D

   It is a Conference of the Member Countries of the Convention on Biological Diversity.

   (d) It is a Conference of the Member Countries of the Convention on Biological Diversity. CBD COPs (Nagoya, Hyderabad) are distinct from Rio+20.

Summary. Official key is (a) It is the United Nations Conference on Sustainable Development. Rio+20 met in 2012 in Rio de Janeiro and produced The Future We Want. It is not a WTO ministerial, an IPCC session, or a CBD COP. Only UNCSD matches the name.